jq添加dom节点，值与值互不影响

用户点击按钮，可以添加多选框与input，新增的值与其他的值互不影响；

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<div id="demo">
		<div id="wrap">
			<!-- <input type="checkbox" name="box">
			<input type="text" value="输入" name="input"> -->
		</div>
	</div>
	<button id="btn">增加</button>
</body>
</html>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
<script>
	var a = 0;   
	var b = 0; 
	var arr = []
	var str = ''
$("#btn").on("click",function() {
	arr = []
	console.log(1)
	a++;
	b++;

var obj = {
	name:'n'+a,
	title:'t'+b
}
 
 arr.push(obj)
 console.log(arr);
	for(let i=0;i<arr.length;i++){
			str += `
			<input type="checkbox" name="${arr[i].name}">
			<input type="text" value="输入" name="${arr[i].title}">
			`
		}
		$("#wrap").html(str);
})
	
</script>